1. [科学知识]Light travels faster than (声音).
2. The speaker's ________ was so low that Nancy could hardly hear him.
A.noise
B.voice
C.sound
D.smell

1. sound
2. B

从方框中选出恰当的单词并用其适当形式填空。
voice sound noise
Living in the world，we can hear different 3. . Some are nice while others are not. There are lots of birds in nature that have a sweet 4. . It's really pleasant to hear them sing in the trees in the morning. On the other hand，the 5. of traffic does make us feel uncomfortable. It affects not only our health but also our mood(情绪).

3. sounds
4. voice
5. noise

6. 在图书馆里制造噪声是不礼貌的。
It's impolite to in the library.

make noise

1. —Have you heard of the classical song ?
—Yes. I have listened to it recently. It sounds a little sad.

A.yet；yet
B.already；yet
C.yet；already
D.already；already

C

本题考查already和yet的用法区别。already通常用于肯定句中，表示“已经”；yet通常用于否定句和疑问句中，表示“还（未）”。第一句是疑问句，用yet；第二句是肯定句，用already。所以答案选C。

用 already 或 yet 填空。
2. Holly has fed the dog，but she hasn't watered the flowers .

1. already
2. yet

1. I have tried many different ways of doing it，but none of them were (success).
2. —I didn't succeed in (get)my driving license only because of a tiny mistake.
—What a pity! You can make it next time.

1. successful
2. getting